/Engine/Plugins/Experimental/LandscapePatch/Source/LandscapePatch/Public/LandscapeTexturePatch.h
Given the landscape resolution, current patch coverage, and a landscape resolution multiplier, gives the needed resolution of the landscape patch. I.e., figures out the number of pixels in the landcape that would be in a region of such size, and then uses the resolution multiplier to give a result.
true if successful (may fail if landscape is not set, for instance)
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=LandscapePatch, Meta=(ResolutionMultiplier="1.0")) virtual bool GetInitResolutionFromLandscape ( float ResolutionMultiplier, FVector2D & ResolutionOut ) const